| 基于纠删码的低时延卫星时隙ALOHA接入方式 |
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| 引用本文： | 尹译,梁俊,林永照,肖楠,王轶.基于纠删码的低时延卫星时隙ALOHA接入方式[J].重庆邮电大学学报(自然科学版),2015,27(3):329-335. |
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| 作者姓名： | 尹译 梁俊 林永照 肖楠 王轶 |
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| 作者单位： | 空军工程大学信息与导航学院,陕西西安,710077 |
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| 基金项目： | 陕西省自然科学基金(2012JM8004) |
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| 摘 要： | 对时隙ALOHA(slotted ALOHA,SA)进行卫星接入的冲突问题进行分析,提出了一种基于纠删码的时隙ALOHA接入方式.该方式将突发数据等分并以包为单位编码,使生成的编码包序列能够通过纠删功能恢复冲突数据包,以实现容忍时隙冲突、缩短接入时延的目的.针对编码策略选取的问题,研究了定长编码策略和喷泉码策略对接入性能的影响.仿真结果表明,基于纠删码ALOHA能有效改善用户接入的时延性能,且喷泉码策略和定长编码相比,性能更为优良.
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| 关 键 词： | ALOHA接入 纠删码 接入时延 用户冲突 信道负载 |
| 收稿时间： | 2014/5/22 0:00:00 |
| 修稿时间： | 2014/12/5 0:00:00 |
Erasure-code-based slotted ALOHA access scheme with low delay in satellite network |
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| YIN Yi,LIANG Jun,LIN Yongzhao,XIAO Nan and WANG Yi.Erasure-code-based slotted ALOHA access scheme with low delay in satellite network[J].Journal of Chongqing University of Posts and Telecommunications,2015,27(3):329-335. |
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| Authors: | YIN Yi LIANG Jun LIN Yongzhao XIAO Nan and WANG Yi |
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| Institution: | College of Information and Navigation, Air Force Engineering University, Xian 710077 , P. R. China,College of Information and Navigation, Air Force Engineering University, Xian 710077 , P. R. China,College of Information and Navigation, Air Force Engineering University, Xian 710077 , P. R. China,College of Information and Navigation, Air Force Engineering University, Xian 710077 , P. R. China and College of Information and Navigation, Air Force Engineering University, Xian 710077 , P. R. China |
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| Abstract: | Collisions will be easily caused in scenarios of multi-user access to the satellite network via slotted ALOHA. To relieve this problem, we propose a new slotted ALOHA scheme which is based on erasure correction. In this scheme, the burst data is divided into segments of equal length and encoded into packets sequence in the way of erasure coding, which enables the generated packets sequence to recover the collided packets. Owing to the recovery mechanism, some collisions are allowed and access delay is improved when referring to the coding strategy. Then the performance of fixed-length code and fountain code in the new scheme is discussed. The simulation result indicates that improved slotted ALOHA has a shorter access delay and the fountain code strategy brings better access delay improvement than fixed-length code. |
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| Keywords: | ALOHA access erasure code access delay user collisions channel load |
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